Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5081bbd942c23ab…

MALICIOUS

PDF

47.1 KB Created: 2021-06-03 22:15:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 21f66c8b1731d6c36c60a77d14157e3e SHA-1: 0919494d907b655e90e556f6ee408e2f087f66ed SHA-256: a5081bbd942c23ab789437b1761117e6498952787462ce07a20b685ed7329549
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a link to a 'game hack' lure, which is a common tactic for tricking users into visiting malicious websites. The presence of a fake CAPTCHA prompt further supports the malicious intent, aiming to deceive users into performing an action. While no scripts were directly extracted, the PDF structure and embedded links suggest a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.online/app/406889139/daily-free-spins-coin-master-heaven-game-hack PDF link annotation
    • http://www.js100.com/uploads/ckeditor/files/roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/roblox-e-free_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-tiktok-like_GM835599320.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/roblox-bloxburg-free-money_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/is-minecraft-free-on-pc_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-free-robux_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/roblox-speed-hack_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-minecraft-svg-cutting-files_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/hack-spin-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/como-hackear-coin-master-gratis_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-hacks-xyz_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/pig-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/buy-robux-free_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-coins-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/robuxfree-con_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005179.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5179 24256 bytes
SHA-256: 404b22758a2e742cc6b127934a9b548a41a5131c45b356ef6e065458f4d08a4d
font_01_sfnt_off000088dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88DC 3380 bytes
SHA-256: 1dd933c112880b232546f3aab6a17784a8f412d39fd551cc6eb31c5a04c3ce57
font_02_sfnt_off000094c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94C4 18420 bytes
SHA-256: 83c7106d652078d6845a2ce66abf209357cb05486614c7f7fe473a519aef161c

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